i want project report on police siren In my project there is 2IC 555, no transiistor , 4 resister. so please give it.

(02-12-2012, 07:55 PM)Guest Wrote: i want project report on police siren In my project there is 2IC 555, no transiistor , 4 resister. so please give it.

project report on police siren free pdf

Abstract

Sirens' used by police, fire and paramedic vehicles have been designed so that they can be heard over large distances, but unfortunately the siren noise enters the vehicle and corrupts intelligibility of voice communications from the emergency vehicle to the control room. Often the siren needs to be turned off to enable the control room to hear what is being said. This paper discusses a siren noise filter system that is capable of removing the siren noise picked up by the two-way radio microphone inside the vehicle. The removal of the siren noise improves the response time for emergency vehicles and thus save lives. To date, the system has been trialed within a fire tender in a non-emergency situation, with good results